| ZIP Code | 78666 |
|---|---|
| City | San Marcos |
| State | Texas (TX) |
| County | Hays County |
| Area Code | 512/737 |
| Elevation | 767 ft |
| Latitude | 29.881662 |
|---|---|
| Longitude | -97.984794 |
| Timezone | Chicago (DST) |
| FIPS | 48209 |
| ZIP Type | Standard |
| Status | Active |
Race & Ethnicity
Age Breakdown
Key Indicators
| Median Age | 27.0 yrs ↑ 6% since 2019 |
|---|---|
| Avg Household Size | 2.35 |
| Below Poverty | 21.5% ▲ 115% above avg |
| College Grads | 43.0% ▲ 11% above avg |
| Unemployment | 5.6% ▲ 14% above avg |
| No HS Diploma | 955 (2.2%) |
| HS Graduate | 10,599 (24.2%) |
| Some College | 4,965 (11.4%) |
| Associates | 8,397 (19.2%) |
| Bachelors | 3,321 (7.6%) |
| Graduate Degree | 15,474 (35.4%) |
Education
Housing Tenure
Home Value Distribution
Financials
| Median HH Income | $55,478 ▼ 27% below avg ↑ 26% since 2019 |
|---|---|
| Median Home Value | $271,900 ≈ Avg ↑ 58% since 2019 |
| Home/Income Ratio | 4.9x (nat avg ~3.5x) |
| Median Rent | $1,294/mo ↑ 23% since 2019 |
| Total Units | 36,354 |
| Vacant Units | 2,518 |
| Avg HH Size | 2.35 |
Income Distribution
How People Get to Work
Commute Time
Year Built
Summary
| Total Units | 36,354 |
|---|---|
| Vacant | 2,518 |
| Owner Occupied | 38.4% |
| Renter Occupied | 61.6% |
| Avg HH Size | 2.35 |
ZIP code 78666 is located in San Marcos, Texas, within Hays County. With a population of 87,775, this is a densely populated ZIP code with a young community — the median age is 27 years. Economically, 78666 is a solidly middle-class ZIP code: the median household income of $55,478 is below the national average.
Real estate in ZIP code 78666 represents a mid-range housing market. The median home value of $271,900 is near the national average. Renters can expect to pay around $1,294 per month in median rent. This is predominantly a renter community, with 61.6% of occupied units rented — typical of urban and transitional neighborhoods. Median home values have increased by 58% since 2019.
The population of 78666 is racially diverse, with White as the largest group at 44.7%. Residents are well-educated — 43.0% hold a bachelor's degree or higher, which is near the national average. Poverty affects a significant share of residents at 21.5%. Household income has grown by 26% since 2019.
The unemployment rate in 78666 stands at 5.6%, which is near the national average. As in most parts of the country, driving alone is the dominant commute mode at 72%.
Overall, ZIP code 78666 in San Marcos, TX is characterized as solidly middle-class, well-educated, and a young community. With 87,775 residents, a median household income of $55,478, and a median home value of $271,900, it offers a clear picture of life in this part of Texas.